A Department of Environmental Conservation report released Wednesday says the contamination put drinking water at risk for 250,000 people.

As CBS2’s Jennifer McLogan reported, dredging of the harbors, inlets, and rivers — so marine traffic can move safely — was supposed to come to an end, but the federal government continues to allow it.

Fisherman Thurman Bryant called it the decline of the Long Island Sound.

“It basically displaces the fish from their natural habitat,” he said.

It was a busy day at Port Jefferson Harbor for those who love the Long Island Sound.

“We have to make sure we take care of it so it can exist for my kids and their kids,” Kaitlin Meehan said.

The Keagan family had just taken the ferry from Connecticut and was surprised to see open water dumping of dredged material as they passed.

“It’s dirty,” an observer noted.

That’s the worry and complaint from those who live on or make a living from the majestic waterway.

A controversial 30-year plan to continue dumping dredged soil, sand, and sediment into Long Island Sound was just approved by the U.S. Army Corps of Engineers and Environmental Protection Agency.

“We consider Long Island sound an extension of our home. It is our front yard, it is our backyard, it is not our junk yard,” Adrienne Esposito said.

Environmentalists said studies show sludge pulled from the bottoms of harbors, inlets, and rivers — allowing cargo ships to safely pass — can contain mercury, lead, and pesticides which harm marine life and water quality.

“By continuing to hold Northrop Grumman and the Navy accountable for their actions, we are ensuring that the responsible parties clean up the groundwater contamination, while securing compensation to revitalize local ecosystems on Long Island,” Gov. Andrew Cuomo said in a statement.

Cuomo and a group of lawmakers from both sides of the aisle threatened to sue to stop the dumping.

“If that includes legal action to stop the federal government then that is what we will do because this cannot happen period,” Cuomo said.

New York lawmakers are urging Connecticut’s politicians and homeowners to join demands to halt the dumping as well.

The financial calculations could take several months. The Navy says it hasn’t been notified of the state’s intended action.